Q. Find the derivative of the following function.y=2−5x4Answer: y′=
Identify components: Identify the components of the function y=2−5x4. The base of the exponent is a constant (2), and the exponent is a function of x (−5x4).
Apply chain rule: Apply the chain rule for derivatives. The chain rule states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.
Derivative of outer function: The outer function is 2u, where u is the inner function −5x4. The derivative of 2u with respect to u is 2u⋅ln(2), because the derivative of ax with respect to x is ax⋅ln(a).
Derivative of inner function: The inner function u(x) is −5x4. The derivative of −5x4 with respect to x is −20x3, because the derivative of xn with respect to x is n⋅xn−1.
Combine derivatives using chain rule: Combine the derivatives of the outer and inner functions using the chain rule.y′=dxd[2−5x4]=(2−5x4⋅ln(2))⋅(−20x3)
Simplify the expression: Simplify the expression for the derivative. y′=−20x3⋅2−5x4⋅ln(2)
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